Wayland/Weston 1.8.0

Wayland is a protocol and windowing library to mediate between clients and display server, and is intended as successor to X11. Weston is a compositor implementation based upon it. Graphical toolkits can support Wayland directly, or use a X11 server (XWayland) for compatibility.

X.org 1.17.0

The X.org server is an open source implementation of the networked X11 Window System. It's the current base of most graphical user interfaces on BSD and Linux systems. Its modular architecture allows running on many different hardware types and settings.